JPH0628747Y2 - Positioning support structure for metal members in resin casing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention relates to improvement of a positioning support structure for a metal member in a resin casing such as a microswitch.

(Prior Art and its Problems) FIG. 6 is a front view showing the internal structure of a conventional microswitch.

In the figure, reference numeral 1 is a resin casing on the main body side, a block portion 2 is provided on the lower half side so as to project, and three fitting grooves 4, 4 provided on the surface of the block portion 2 are provided. One movable contact terminal metal fitting 6 and two fixed contact terminal metal fittings 8 and 10 are fitted to each other by being fitted to 4,4. A switch operating space 14 surrounded by the block portion 2 and the rising wall portion 12 is provided on the upper side of the block portion 2 of the resin casing 1, and the terminal metal fittings 6, 8, Each of the upper portions 6a, 8a, 10a of the terminal 10 and the movable piece 18 mounted on the upper portion 6a of the terminal fitting 6 via the spring plate 16 are arranged, and the upper portions 8a, 10a of the both terminal fittings 8, 10 are arranged. The fixed contacts 20 and 22 respectively attached to the ends of the movable piece 18 are located so as to face each other via the movable contact 24 attached to the end of the movable piece 18.

Reference numeral 26 denotes a push button, which is provided by being installed in an opening 28 provided in the rising wall portion 12, the upper side of which protrudes upward from the opening 28, and the lower side thereof is positioned on the movable piece 18. . In the state where the respective members are attached to the resin casing 1 on the main body side as described above, the resin casing on the cover side (not shown) is integrally mounted from the front side to configure the microswitch, and Each is a fitting hole into which the boss is fitted when the resin casing on the cover side is mounted.

Further, in the above configuration, when the push button 26 is not pushed in, the movable piece 18 is urged upward by the spring force of the leaf spring 16 so that the movable contact 24 is fixed.
When the push button 26 is pressed, the movable piece 18 is displaced downward against the urging force of the leaf spring 16, and the movable contact 24 contacts the fixed contact 20. Is configured to.

In such a micro switch, the terminal fitting 6 is fitted and attached to the fitting groove 4 of the block portion 2 as described above, but the upper portion 6a of the terminal fitting 6 needs to hold the movable piece 18 at a predetermined position. The portion 6a itself must also be positioned at a predetermined position, so that the lower surface of the upper portion 6a and the end surface of the bent portion 3 at the tip end are aligned with the rising wall 12 side of the resin casing 1 on the block portion 2 side. Positioning is performed by being pressed and supported from the up and down direction on each of the provided support projections 5 and 7.

However, in the case where the terminal fitting 6 is positioned and supported as described above, there is no problem if the casing strengths of the resin casing 1 are substantially equal in the respective support portions. Part 7
When the support protrusions 5 are provided on the side of the rising wall portion 12 where the wall thickness is not so thick and on the side of the trapezoidal block portion 2, the rising wall portion 12 is deformed due to the difference in strength,
Along with the deformation, the bent portion 3 side of the terminal fitting 6 is located above the predetermined position, and there is a problem that the positioning is not accurately performed. The above-mentioned deformation of the rising wall portion 12 causes the contacts 20, 22, 24 when the micro switch is used.
This occurred remarkably when the resin casing 1 was heated and softened by the heat generated in the part.

(Object of the Invention) The present invention has been made in view of the above circumstances, and a metal member positioning support structure in a resin casing in which a metal member is supported at a predetermined position without deformation of the resin casing. The purpose is to provide.

(Structure and Effect of the Invention) In order to achieve such an object, the present invention provides a metal member in a resin casing, which is configured by pressing and supporting a plurality of points of the metal member at a plurality of points of the resin casing. In the positioning support structure of No. 3, among a plurality of points for positioning and supporting the metal member of the resin casing, the casing strength in the vicinity thereof is relatively large compared to other points, and the metal member is deformed by pressure contact. The configuration is such that a deformable protrusion that can be deformed is provided.

According to this configuration, when a large pressure contact force is applied to a plurality of points on the resin casing from the metal member side when positioning and supporting the metal member on the resin casing, the vicinity of the plurality of points relative to other points is relatively increased. The deformable protrusion provided at the point where the casing strength is large is deformed, and this deformation absorbs the pressure contact force and reduces the pressure contact force applied to the supporting point on the side where the casing strength is weak, and this reduces the strength of the casing part where the strength is weak. Deformation is prevented.

Therefore, according to the present invention, when a large pressure contact force is applied from the metal member side to the resin casing side, the deformable protrusion is deformed so that the pressure contact force does not reach the resin casing side, which is weak in strength. Therefore, this makes it possible to prevent the deformation of the resin casing, and as a result, it becomes possible to accurately position and support the metal member at a predetermined position of the resin casing.

(Description of Embodiments) Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view showing the internal structure of the microswitch, and FIG.
The figure is the same exploded perspective view.

The basic structure and operation of the micro switch shown in these figures are the same as those of the conventional micro switch shown in FIG. 6, and therefore their explanations are omitted, and the elements shown in FIGS. The same reference numerals as those in FIG. 6 denote the same elements as those in FIG.

In FIG. 2, reference numeral 21 is a resin casing on the cover side, and the inner surface thereof is provided with the fitting holes 30 provided in the resin casing 1 when the resin casing 1 is mounted on the main body side. Three large and small bosses 23 to be fitted are provided, and the large bosses 23 on both sides thereof are cylindrical, and the through holes 25 are used as mounting holes for the microswitch. Further, the fitting grooves 27 of the terminal fittings 6, 8 and 10 are provided at the positions corresponding to the fitting grooves 4 of the resin casing 1. In addition, the resin casing 21
When using an actuator that presses the push button 26, a shaft support portion 2 of the actuator is used at one corner of the surface of the actuator.
9 is provided so as to project. Although not shown in the figure, the shaft support portion 29 is provided in the resin casing 1 at a position corresponding to the shaft support portion 29 of the resin casing 21.

Next, the main body side resin casing 1 which is a feature of the present invention
The positioning support structure of the upper portion 6a of the terminal fitting 6 as the metal member will be described.

The supporting projection 7 on the side of the rising wall 12 that supports the end surface of the bent portion 3 of the upper portion 6a of the terminal fitting 6 is provided wide so that the side surface thereof has a trapezoidal shape as in the conventional example. However, as shown in FIG. 3, the supporting convex portion 9 on the side of the block portion 2 as a deformable projecting portion for supporting the lower surface side of the upper portion 6a is formed by a convex strip having a narrow side surface shape. Moreover, each of the supporting projections 9 is provided with the recessed strips 11 on both edges thereof. That is, the strength of the supporting protrusions 9 is made smaller than that of the supporting protrusions 7 by forming the supporting protrusions 9 into a convex shape. Therefore, by providing the concave stripes 11 on both edges, the side surface shape of the support convex portion is made more elongated.

In the above configuration, when the terminal metal fitting 6 is attached to the resin casing 1 on the main body side, and when the resin casing 1 is softened by heat during use, the terminals are provided on both the supporting protrusions 7 and 9. When a large force is applied from the metal fitting 6 side, as shown in FIG. 4, the supporting projection 9 having low strength is first crushed and deformed, whereby the force applied to the supporting projection 7 side is reduced, and the rising wall portion rises. The deformation of 12 is avoided.

FIG. 5 illustrates another example of the support protrusions 9. In this embodiment, the support protrusions 9 have a narrower tip end side so that the crush deformation can be performed more easily.

Of the elements shown in FIGS. 3 to 5 described above, those given the same reference numerals as those in FIG. 6 are the same elements as those shown in FIG.

[Brief description of drawings]

1 to 5 relate to an embodiment of the present invention. FIG. 1 is a front view showing the internal structure of a microswitch, FIG. 2 is an exploded perspective view of the same, and FIG. FIG. 4 is an enlarged perspective view of a portion, FIG. 4 is a cross-sectional view of a main portion showing a deformation of the support convex portion, and FIG. 5 is a cross-sectional view of a main portion showing another embodiment of the support convex portion. FIG. 6 is a front view showing the internal structure of a conventional microswitch. 1 ... Resin casing on the main body side, 6 ... Terminal fittings (metal member), 9 ... Support protrusion (deformable protrusion).

Claims (1)

[Scope of utility model registration request] 1. A positioning support structure for a metal member in a resin casing, wherein a plurality of points of the metal member are pressed against and supported by a plurality of points of the resin casing, and the metal member of the resin casing is positioned and supported. Among the plurality of points, a deformable protrusion that is deformable by pressure contact of the metal member is provided at a point where the casing strength in the vicinity thereof is relatively larger than the other points. Positioning support structure for metal members in resin casing.